Searching for freestanding shower stall

I am searching for a manufacture that builds a heavy-duty free standing shower stall. The shower stall needs to have a frame strong enough to support the installation of stainless steel grab bars. So far I have not been able to locate a freestanding shower stall that meets this requirement.

I'm not a pro...In looking around, I've never seen one like that. You could have one built - I'm assuming you want this totally free-standing? I did see some kits designed for tiling that could be quickly assembled then tiled. These were made by a company in (I think) Germany. www.wedi.de some really neat designs. They have a US distributor, but I've don't know how easy it is to find. One design they had was sort of a spiral, there wer others, too. Pretty neat.